Performance analysis of two tier HetNets with massive MIMO enabled wireless backhauling

Abstract

Dense deployment of small cells escalates the network capacity, making it a candidate technology for the future wireless network. However, backhauling of such a large number of small cells becomes a major challenge in its successful deployment. In this paper, a framework for massive MIMO enabled wireless backhauling in a two-tier heterogeneous network is developed. The framework considers massive MIMO enabled macro base station and in-band full-duplex (IBFD) small cell base station. Massive MIMO system provides high spectral efficiency and high energy efficiency. Besides, due to IBFD capability, the small cells can utilize the same frequency band to communicate over the access link and the backhaul link simultaneously. Tools from the stochastic geometry are utilized to model and derive the analytical expressions of coverage probability and area spectral efficiency (ASE). Furthermore, a trade-off between ASE and coverage probability is observed. All the analytical results are verified by simulation. Simulation results show that massive MIMO and IBFD communication may be useful technologies from the backhauling perspective in the dense small cell network. It is observed that the proposed framework provides 42.30% improvement in the coverage performance over the other existing framework for rate threshold of 1 bps/Hz. Furthermore, optimal performance for the proposed model can be achieved by tuning of bandwidth allocation factor.